<!DOCTYPE html>
<style>
#scroller {
  width: 400px;
  height: 400px;
  overflow-y: scroll;
}

.box {
  min-height: 100px;
  width: 100px;
}

#anchor {
  background: orange;
}

#anchored {
  width: 100px;
  height: 100px;
  background: green;
}
</style>

<div id="scroller">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box" id="anchor"></div>
  <div id="anchored"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>

<script>
scroller.scrollTop = 150;
</script>

